Added a syntax line for avi.
Added a syntax line for avi.

Original commit message from CVS:
Added a syntax line for avi.

magcius/gstreamer,jpakkane/gstreamer,krichter722/gstreamer,magcius/gstreamer,ensonic/gstreamer,krichter722/gstreamer,centricular/gstreamer,centricular/gstreamer,drothlis/gstreamer,drothlis/gstreamer,magcius/gstreamer,shelsonjava/gstreamer,krieger-od/gstreamer,Lachann/gstreamer,lubosz/gstreamer,krichter722/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,lubosz/gstreamer,collects/gstreamer,Lachann/gstreamer,lovebug356/gstreamer,ahmedammar/platform_external_gst_gstreamer,mrchapp/gstreamer,ylatuya/gstreamer,Lachann/gstreamer,collects/gstreamer,centricular/gstreamer,justinjoy/gstreamer,ahmedammar/platform_external_gst_gstreamer,lovebug356/gstreamer,shelsonjava/gstreamer,krieger-od/gstreamer,krichter722/gstreamer,krieger-od/gstreamer,magcius/gstreamer,Distrotech/gstreamer,jpakkane/gstreamer,jpxiong/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,ylatuya/gstreamer,cablelabs/gstreamer,Distrotech/gstreamer,ahmedammar/platform_external_gst_gstreamer,mrchapp/gstreamer,justinjoy/gstreamer,lubosz/gstreamer,cfoch/gstreamer,collects/gstreamer,ensonic/gstreamer,drothlis/gstreamer,justinjoy/gstreamer,ylatuya/gstreamer,mparis/gstreamer,cfoch/gstreamer,jpxiong/gstreamer,krieger-od/gstreamer,ensonic/gstreamer,drothlis/gstreamer,lubosz/gstreamer,justinjoy/gstreamer,cablelabs/gstreamer,jpakkane/gstreamer,mrchapp/gstreamer,cfoch/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,Lachann/gstreamer,StreamUtils/gstreamer,mparis/gstreamer,surround-io/gstreamer,Distrotech/gstreamer,Distrotech/gstreamer,cfoch/gstreamer,justinjoy/gstreamer,cablelabs/gstreamer,magcius/gstreamer,lovebug356/gstreamer,mrchapp/gstreamer,Lachann/gstreamer,centricular/gstreamer,surround-io/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,lovebug356/gstreamer,StreamUtils/gstreamer,cablelabs/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,ensonic/gstreamer,ahmedammar/platform_external_gst_gstreamer,cfoch/gstreamer,drothlis/gstreamer,collects/gstreamer,lubosz/gstreamer,ensonic/gstreamer,ylatuya/gstreamer,centricular/gstreamer,ahmedammar/platform_external_gst_gstreamer,ylatuya/gstreamer,mparis/gstreamer,jpxiong/gstreamer,surround-io/gstreamer,shelsonjava/gstreamer,lovebug356/gstreamer,collects/gstreamer,krieger-od/gstreamer,StreamUtils/gstreamer,surround-io/gstreamer,Distrotech/gstreamer,cablelabs/gstreamer,mrchapp/gstreamer,jpakkane/gstreamer,mparis/gstreamer